#ifndef _LINUX_PERSONALITY_H
#define _LINUX_PERSONALITY_H

#ifdef __KERNEL__

/*
 * Handling of different ABIs (personalities).
 */

struct exec_domain;
struct pt_regs;

extern int register_exec_domain(struct exec_domain *);
extern int unregister_exec_domain(struct exec_domain *);
extern int __set_personality(unsigned long);

#endif /* __KERNEL__ */

/*
 * Flags for bug emulation.
 *
 * These occupy the top three bytes.
 */
enum {
	ADDR_NO_RANDOMIZE = 0x0040000,	/* disable randomization of VA space */
	FDPIC_FUNCPTRS = 0x0080000,	/* userspace function ptrs point to descriptors
					 * (signal handling)
					 */
	MMAP_PAGE_ZERO = 0x0100000,
	ADDR_COMPAT_LAYOUT = 0x0200000,
	READ_IMPLIES_EXEC = 0x0400000,
	ADDR_LIMIT_32BIT = 0x0800000,
	SHORT_INODE = 0x1000000,
	WHOLE_SECONDS = 0x2000000,
	STICKY_TIMEOUTS = 0x4000000,
	ADDR_LIMIT_3GB = 0x8000000,
};

/*
 * Security-relevant compatibility flags that must be
 * cleared upon setuid or setgid exec:
 */
#define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC  | \
			    ADDR_NO_RANDOMIZE  | \
			    ADDR_COMPAT_LAYOUT | \
			    MMAP_PAGE_ZERO)

/*
 * Personality types.
 *
 * These go in the low byte.  Avoid using the top bit, it will
 * conflict with error returns.
 */
enum {
	PER_LINUX = 0x0000,
	PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,
	PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS,
	PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
	PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
	PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE,
	PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
	PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
	PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
	PER_BSD = 0x0006,
	PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
	PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
	PER_LINUX32 = 0x0008,
	PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
	PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,	/* IRIX5 32-bit */
	PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,	/* IRIX6 new 32-bit */
	PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,	/* IRIX6 64-bit */
	PER_RISCOS = 0x000c,
	PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
	PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
	PER_OSF4 = 0x000f,	/* OSF/1 v4 */
	PER_HPUX = 0x0010,
	PER_MASK = 0x00ff,
};

#ifdef __KERNEL__

/*
 * Description of an execution domain.
 * 
 * The first two members are refernced from assembly source
 * and should stay where they are unless explicitly needed.
 */
typedef void (*handler_t) (int, struct pt_regs *);

struct exec_domain {
	const char *name;	/* name of the execdomain */
	handler_t handler;	/* handler for syscalls */
	unsigned char pers_low;	/* lowest personality */
	unsigned char pers_high;	/* highest personality */
	unsigned long *signal_map;	/* signal mapping */
	unsigned long *signal_invmap;	/* reverse signal mapping */
	struct map_segment *err_map;	/* error mapping */
	struct map_segment *socktype_map;	/* socket type mapping */
	struct map_segment *sockopt_map;	/* socket option mapping */
	struct map_segment *af_map;	/* address family mapping */
	struct module *module;	/* module context of the ed. */
	struct exec_domain *next;	/* linked list (internal) */
};

/*
 * Return the base personality without flags.
 */
#define personality(pers)	(pers & PER_MASK)

/*
 * Change personality of the currently running process.
 */
#define set_personality(pers) \
	((current->personality == (pers)) ? 0 : __set_personality(pers))

#endif /* __KERNEL__ */

#endif /* _LINUX_PERSONALITY_H */
